How much time has elapsed when the cars are 200m apart?

1. The problem statement, all variables and given/known data
Two cars are parked beside each other, facing in opposite directions. Car 1 accelerates at 5m/s^2 up to a max. speed of 25m/s, and Car 2 accelerates at 4m/s^2 up to a max. speed of 24m/s. How much time has elapsed when the cars are 200m apart?

These times are wrong
"v=d/t" is used when velocity is constant, which it is not when the cars start off.
Try using the equation, "vf=vi + at" to find how long it takes for each car to accelerate to its maximum speed. That should put you on the right track anyway.

How can the two cars have different distances remaining? What did you get for the distance that the two cars have traveled once they both reach max. acceleration? Add them together and you get their separation.